ISIS have Iraqi Army and Police members as captives

I managed to know from a trustworthy source who is close to the armed forces that there are captives from the Iraqi Army and Iraqi Police kept with the armed forces. One armed man tried to insult a captive police man whom he used to know before the crisis and was a reason in putting him in prison, so he tried to take his revenge from him. However, two armed men (Arabs, not Iraqis) stopped him from doing so. It had been agreed by them to let go all the captives very soon.